Auxiliary reservoir for pumps



May 5, 1958 J. A. ROBERTS ET AL 2,833,310

AUxlLlARY RESERVOIR vFOR PUMPS original Filed April '7, 1948 .ERS

AUXILIARY RESERVOIR FOR PUNIPS James A. Roberts, Howard R. Fischer, aud Marcel P. DHaem, Utica, N. Y., assignors to Chicago Pneumatic Tool Company, New York, N. Y., a corporation of New Jersey Application October 16, 1951, Serial No. 252,762, now- Patent No. 2,685,865, dated August 10, 1954, which is a division of application Serial No. 19,478, April 7, 1948, now Patent No. 2,588,164, dated March 4, 1952. Divided and this application November 4, 1953, Serial No. 390,234

3 Claims. (ci. 13s-30) This invention relates to an auxiliary reservoir .for pumps, more particularly pneumatically powered hydraulic pumps.

This application is a division of our application Serial No. 252,762 filed October 16, 1951, now Patent No. 2,- 685,865, which contains claims to an air motor forming part of a pump; the latter application is a division of our original application Serial No. 19,478, tiled April 7, 1948, which issued as Patent No. 2,588,164, on March 4, 1952.

The device of the invention alords a convenient auxiliary source of hydraulic lluid for a pneumatically powered hydraulic pump, as' will be realized from a study of our original application, now Patent 2,588,164. ln addition to providing a greatly increased operating range for said pump when used therewith, a secondary feature of this auxiliary reservoir is that it provides a convenient spare part source for the pump itself, in event the reservoir of the latter should require replacement.

The object of this invention is to provide an auxiliary reservoir for pumps of the pneumatically powered hydraulic type.

Another object is to provide an `auxiliary reservoir for pneumatically powered hydraulic pumps wherein certain elements of the auxiliary reservoir as interchangeable with similar elements in the pumps.

These and further objects and features of the invention will become more apparent from a reading of the following description when considered with the accompanying drawing wherein:

Fig. 1 is a longitudinal View, partly in section, showing an illustrative auxiliary reservoir in accordance with the invention;

Fig. 2 is a full size section view of a part of same taken along line 2-2 in Fig. 3; and

Fig. 3 is an end View of the part shown in Fig. 2.

The auxiliary reservoir system is simple in structure and ybasically consists of three main parts, a connection block 164, and two reservoir portions 102a, each containing an oil reservoir bag 103a. The reservoir portions 102g are connected to the block 164 on opposite sides thereof by means of four bolts106 which extend through the connection block. A tapered pilot 107a is located on opposite sides of the block 164, the purpose of each pilot being for the convenient centering of the reservoirs 102:1 with respect the block 164, and also for fixing the reservoir bags 103:1 in liquid tight manner as shown. Extending into the block 164 from one face are two bores 165 and 166, each having a threaded portion at the entrance thereof. Passageways 167, leading from the bore 165 at two points, exit on each side of said block 164 in a region near the base of each pilot 107a, each of said passageways 167 being located in line with the opening of passageway 44a in the reservoir portion 102a. The bore 166 has passageways 168 leading therefrom at ICC two points, and opening on the surface of each pilot 107a in the region of the open end of the oil bag-103a. A transverse passageway 169, having a diameter 'approximately equal to the diameter of the bore 166, extends through the block 164 and connects the bore 166 to the' v surface of each pilot 107a, the ends of said passageway 169 also being in the region of the open end of the oil bag 103a.

The oil reservoir bag 103e is preferably formed of a synthetic oil resistant rubber, such as neoprene. When the auxiliary reservoir is attached to a pump,the bag 103a is completely filled with oil, and hence lls thereservoir 102a, with the exception of a longitudinal `region on the inside wherein a spacer means in the form of' a flat strip 104a keeps the bag 103a away from the inner wall of the reservoir for the entire length of-the strip' i 104:1. The strip 104a is riveted at one end to the wall of the reservoir 102a, and is so arranged that an air passageway 44a exits into the space formed between` the strip and inner wall of the reservoir 10211. The purpose of such detail is that when compressed air emerges from passageway 44a during pump operation, it will tend to act along the entire length of the reservoir bag 103:1,

and thus avoid uneven collapse of the bag under pneu-v matic pressure.

The auxiliary reservoir is connected to the pump by means of' two pipes or hoses, not shown, but represented diagrammatically by the broken lines O and -A. The pipe O is used to convey oil, or other hydraulic medium, and one end thereof is threadedly connected, by means of standard pipe connections, to the bore 166 in block 164, the other end of the pipe O being threadedly connected to an oil outlet of the pump, as illustrated and described in Patent 2,588,164. The pipe A is used to convey air, or other pneumatic medium, and one end thereof is threadedly connected by means of standard pipe connection, to the bore 165 in block 164, the other end being threadedly connected to an air outlet of the pump, as illustrated yand described in said patent.

From the foregoing it will be seen that when air pressure from pipe A is admitted to the reservoir by way of passage 44a, the bag 103:1 is collapsed, and oil is forced out by way of passage 168, to the pipe O. Likewise when the air pressure in pipe A is released, oil under pressure in pipe O will be allowed to flow back into the reservoir bag 103a. It will further -be seen that the reservoirs 102a are arranged to -be interchangeable with the reservoir used in the pump of applicants Patent 2,- 588,164; to this end the identical parts bear the same identifying numerals, except that `corresponding elements in this application have numerals which are sutlxed with the letter a.

What is claimed is:

l. An auxiliary dual reservoir for pumps, comprising a cylindrical tank having an open end, a collapsible bag disposed within the tank adapted when filled with hydraulic fluid to expand so as to line the interior wall of the tank, the latter wall having a conical female seat at its open end and the open end of the bag having a margin-al portion lining the seat, a second similar tank and bag arrangement having its open end disposed in opposed relation to that of the first tank, a pressure air and hydraulic flow block disposed between the open ends of both tanks and characterized by a male conical seat formed at opposite ends of the block, each male seat fitted into the open end of a bag of one of the tanks so as to Wedge the marginal end of the bag lluid tight against the female seat, an annular shoulder about the block common to both tanks, a ilange formed about the open end of each tank, one of the anges abutting against one side of the shoulder and the other lagainst the other side, fastening means through the llanges and the block whereby the tanks are held fast to the latter, a pressure air supply passage in the block communicating through opposite end portionsY of the block immediately with the tanks between the outer surfaces lof `the bags and the interior walls of the`tanks and a hydraulic fluid llow passage in the block commu nicating through opposite ends of the latter immediately with the open ends of both bags.

2. An auxiliary dual reservoir as defined in claim 1, wherein the outer end of cach tank is closed over by a semi-circular portion of the tank wall, and there'is disposed within each tank a flat strip one end of which is affixed to the interior wall ofthe tank near the open end thereof and the other end of which is free and spaced from thel interior wall and extends substantially the length of the interior wall to a point short of the semicircular end. thereof whereby a space is provided about the strip between the adjacent portion of the bag and the `wall of the tank, and the air passage to the tank communicates with this space.

3. In an auxiliary dual reservoir, including a cylindrical tank having an open end with anges thereon, a collapsible -bag disposed within the tank adapted when lled with hydraulic fluid to expand so as to line the interior wall of the tank, the latter wall having a conical female seat vat its open end and the open end of the bag having a marginal portion lining the se t, and a second similar tank and bag arrangement having its open end disposed in opposed relation to that of the first tank, the improvement comprising a pressure air and hydraulic ow block disposed between the open ends of both tanks and characterized by a male conical seat formed at opposite ends of the block, each male seat titted into the open end of a bag of one of the tanks so as to wedge the marginal end of the bag fluid tight against the female seat, means securing anged ends of the tanks `fast to the block, a pressure air supply passage in the block communicating through opposite end portions of the block immediately with the tanksbetween the outer surfaces of the bags and the interior walls of the tanks, and a hydraulic fluid flow passage in the block communicating through opposite ends of the latter immediately with the open ends of both bags.

References Cited in the iile of this patent UNlTED STATES PATENTS 315,453 Waddell Apr. 7, 1885 2,105,160 Piquerez Jan. 11, 1938 2,439,053 Moore Apr. 6, 1948 2,440,365 Copping et al Apr. 27, 1948 2,459,317 Granberg Jan. 18, 1949 2,540,676 Johnson et al. Feb. 6, 1951 2,583,231 Ragland Ian. 22, 1952 2,609,001 Hebard Sept. 2, 1952 2,638,932 Alexander May 19, 1953 FOREIGN PATENTS 811,137 France Jan. 14, 1937 

